Well yes, of course you can; you can lose weight on any food as long as you create a calorie deficit and eat less energy than you expend. But of course, the quality of those calories is pretty important long term.
This is a fun (although not for Julian Lee, the reporter doing 30 days of pies and beer) series of stories on current-affairs show Story, to which I'm contributing. I'm there as a sort of 'voice of reason' I think!
Watch the first episode here, and the follow-up after a week here.